EP 2934022 A1 20151021 - LOUDSPEAKER
Title (en)
LOUDSPEAKER
Title (de)
LAUTSPRECHER
Title (fr)
HAUT-PARLEUR
Publication
Application
Priority
JP 2014002010 U 20140417
Abstract (en)
A loudspeaker 1 according to the present invention comprises a hermetically-sealed enclosure 3, a first driver 2a arranged at outside of the enclosure 3 and along a wall of the enclosure 3, a second driver 2b arranged at inside of the enclosure 3 and parallel to the first driver 2a across the wall of the enclosure 3 from the first driver 2a, and a pipe 7 communicating the first driver and the second driver. Each of the drivers 2a and 2b has a diaphragm 4, and a frame 5 surrounding the diaphragm 4. The frame 5 has an opening 5a. The pipe 7 is connected to the opening 5a of the frame 4 of the first driver 2a, penetrates through the wall of the enclosure 3, and is connected to the opening 5a of the frame 4 of the second driver 2b, and thereby forming one hermetically-sealed space enclosed with the diaphragms 4 and the frames 5 of the two drivers 2a and 2b. The second driver 2b is configured to output a signal of opposite phase to that of the first driver 2a. Thus, reaction of the diaphragm 4 can be canceled, and a problem of back pressure of the loudspeaker 1 can be removed.
IPC 8 full level
H04R 1/28 (2006.01)
CPC (source: EP US)
H04R 1/02 (2013.01 - US); H04R 1/2803 (2013.01 - EP US); H04R 1/2869 (2013.01 - US); H04R 1/2888 (2013.01 - US); H04R 2400/11 (2013.01 - US)
Citation (search report)
- [A] US 4799264 A 19890117 - PLUMMER JAN P [US]
- [A] EP 2475191 A2 20120711 - ZORZO CO LTD [JP]
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
EP 2934022 A1 20151021; EP 2934022 B1 20160817; CN 105025421 A 20151104; US 2015304748 A1 20151022; US 9407979 B2 20160802
DOCDB simple family (application)
EP 15162448 A 20150402; CN 201410500280 A 20140926; US 201514677003 A 20150402